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Segmented information - Segmented Information (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2021
CAD ($)
Jun. 30, 2020
CAD ($)
Dec. 31, 2021
CAD ($)
segment
Dec. 31, 2020
CAD ($)
Operating Segments [Abstract]        
Number of operating segments | segment     3  
Disclosure of operating segments [line items]        
Operating revenues     $ 23,449 $ 22,883
Operating costs     (13,556) (13,276)
Segment profit     9,893 9,607
Severance, acquisition and other costs     (209) (116)
Depreciation and amortization     (4,609) (4,404)
Finance costs        
Interest expense     (1,082) (1,110)
Interest on post-employment benefit obligations     (20) (46)
Impairment of assets     (197) (472)
Other income (expense)     160 (194)
Income taxes     (1,044) (792)
Net earnings from continuing operations     2,892 2,473
Net earnings from discontinued operations     0 226
Total net (losses) income     2,892 2,699
Goodwill     10,572 10,604
Indefinite-life intangible assets     9,775 7,840
Capital expenditures     4,837 4,202
Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     20,350 19,832
Total products        
Disclosure of operating segments [line items]        
Operating revenues     3,099 3,051
BELL WIRELESS        
Disclosure of operating segments [line items]        
Operating revenues     8,948 8,630
Finance costs        
Goodwill     3,046 3,046
Indefinite-life intangible assets     6,148 4,063
Capital expenditures     1,120 916
BELL WIRELESS | Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     6,355 6,122
BELL WIRELINE        
Disclosure of operating segments [line items]        
Operating revenues     11,820 11,884
Finance costs        
Goodwill     4,580 4,612
Indefinite-life intangible assets     1,692 1,692
Capital expenditures     3,597 3,161
BELL WIRELINE | Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     11,314 11,341
BELL WIRELINE | Total products        
Disclosure of operating segments [line items]        
Operating revenues     506 543
BELL MEDIA        
Disclosure of operating segments [line items]        
Operating revenues     2,681 2,369
Finance costs        
Impairment of assets $ (163) $ (452)    
Goodwill     2,946 2,946
Indefinite-life intangible assets     1,935 2,085
Capital expenditures     120 125
BELL MEDIA | Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     2,681 2,369
BELL MEDIA | Total products        
Disclosure of operating segments [line items]        
Operating revenues     0 0
Intersegment eliminations        
Disclosure of operating segments [line items]        
Operating revenues     (764) (756)
Operating costs     764 756
Finance costs        
Capital expenditures     0 0
Intersegment eliminations | Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     (758) (749)
Intersegment eliminations | Total products        
Disclosure of operating segments [line items]        
Operating revenues     (6) (7)
Intersegment eliminations | BELL WIRELESS        
Disclosure of operating segments [line items]        
Operating revenues     51 53
Intersegment eliminations | BELL WIRELESS | Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     45 47
Intersegment eliminations | BELL WIRELESS | Total products        
Disclosure of operating segments [line items]        
Operating revenues     6 6
Intersegment eliminations | BELL WIRELINE        
Disclosure of operating segments [line items]        
Operating revenues     358 322
Intersegment eliminations | BELL WIRELINE | Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     358 321
Intersegment eliminations | BELL WIRELINE | Total products        
Disclosure of operating segments [line items]        
Operating revenues     0 1
Intersegment eliminations | BELL MEDIA        
Disclosure of operating segments [line items]        
Operating revenues     355 381
Intersegment eliminations | BELL MEDIA | Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     355 381
Intersegment eliminations | BELL MEDIA | Total products        
Disclosure of operating segments [line items]        
Operating revenues     0 0
Operating segments | BELL WIRELESS        
Disclosure of operating segments [line items]        
Operating revenues     8,999 8,683
Operating costs     (5,146) (5,017)
Segment profit     3,853 3,666
Operating segments | BELL WIRELESS | Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     6,400 6,169
Operating segments | BELL WIRELESS | Total products        
Disclosure of operating segments [line items]        
Operating revenues     2,599 2,514
Operating segments | BELL WIRELINE        
Disclosure of operating segments [line items]        
Operating revenues     12,178 12,206
Operating costs     (6,863) (6,960)
Segment profit     5,315 5,246
Operating segments | BELL WIRELINE | Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     11,672 11,662
Operating segments | BELL WIRELINE | Total products        
Disclosure of operating segments [line items]        
Operating revenues     506 544
Operating segments | BELL MEDIA        
Disclosure of operating segments [line items]        
Operating revenues     3,036 2,750
Operating costs     (2,311) (2,055)
Segment profit     725 695
Operating segments | BELL MEDIA | Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     3,036 2,750
Operating segments | BELL MEDIA | Total products        
Disclosure of operating segments [line items]        
Operating revenues     $ 0 $ 0